Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9YC callsign genealogy
Currently held by THOMPSON, CLARK M
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by K9YC's current licensee, walking backwards.
- BROWN, JAMES WILgranted 1998-07-02cancelled 2003-08-12
Successor callsigns
Callsigns held now by people who previously held K9YC.
- THOMPSON, CLARK MWIgranted 2021-01-28
All historical holders
Every license row we've seen with the callsign K9YC, oldest first.
- THOMPSON, CLARK M WI2000-09-06 → cancelled 2001-04-27
- BROWN, JAMES W CA2023-05-16 active